Rivermatics

USGS Streamgage 13063000

Blackfoot River Ab Reservoir near Henry, ID

Blackfoot River Ab Reservoir near Henry, ID is USGS streamgage 13063000 in Idaho, monitoring river discharge in hydrologic subbasin 17040207. It sits on the Blackfoot River, alongside 3 other gauges Rivermatics tracks on the same river. It drains a watershed of about 333 square miles. Discharge records at this site go back to 1914. Typical flow runs near 104.3 cfs in July and 257.3 cfs in April, with the higher of the two arriving in April. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.

View live conditions & forecast →

Gauge details

State
Idaho
Drainage area
333 sq mi
Subbasin (HUC-8)
17040207
Coordinates
42.81528, -111.50667
USGS site number
13063000
Records begin
1914-03-25 (112 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Blackfoot River Ab Reservoir near Henry, ID. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.

Forecast daily mean discharge in cubic feet per second, by date
Date Low p10 Expected p50 High p90 Range
11.6 13.2 15.9
10.8 13.3 17.4
9.9 12.6 17.2
9.2 12.1 16.9
8.7 11.8 17.1
8.4 11.6 17.6
8.2 11.6 18.5
8 11.8 20.3
7.9 11.9 21.4
7.6 11.7 21.6
7.2 11.2 20.7
7.1 11.2 21.7
6.8 11 21.5
6.6 11 22.4

All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 112 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 30.4 56 82.5
February 28.2 56.8 87.3
March 43.7 68.8 135.5
April 103.7 257.3 621.9
May 127.8 402.4 971.6
June 66.6 217.5 528.2
July 32.3 104.3 217.5
August 27.2 73.2 139.1
September 30.6 64.3 117.4
October 36.5 73.1 121.8
November 39.4 75.4 117.9
December 32.5 65.7 105.5

All values in cubic feet per second (cfs).

Common questions

When does Blackfoot River Ab Reservoir near Henry, ID normally run highest?
May, on the long-term record. The median daily flow that month is about 402.4 cfs, against 56 cfs in January, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Blackfoot River Ab Reservoir near Henry, ID?
It depends on the month. In January, half of days historically fall near 56 cfs, with the middle 80% of days between 30.4 and 82.5 cfs. The month-by-month table on this page gives the full range.
How long has Blackfoot River Ab Reservoir near Henry, ID been measured?
Discharge records at USGS site 13063000 begin in 1914, about 112 years, covering roughly 6,801 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Blackfoot River Ab Reservoir near Henry, ID?
Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
Where is Blackfoot River Ab Reservoir near Henry, ID?
The gauge sits at 42.81528, -111.50667, in Idaho, in hydrologic subbasin 17040207, draining roughly 333 square miles.
Can I use Blackfoot River Ab Reservoir near Henry, ID data for flood or safety decisions?
No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.

Upstream and downstream on the Blackfoot River

Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Blackfoot River in full.

Other gauges in this subbasin